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Dot blot is a simple method for detecting biological samples such as proteins or nucleic acids. Unlike western or southern blotting, it involves applying samples directly onto a membrane for detection. Dot blot is versatile and can be used for various applications, including monitoring labeling efficiency, estimating protein concentrations, and comparing antibody performance. For instance, to assess labeling efficiency with biotin, one would compare the labeled sample to a known biotinylated reference standard. This involves creating serial dilutions of both the test sample and the reference, ensuring identical dilution methods. A 10-fold serial dilution is suggested for a broad range of concentrations.